CN109201887A - A kind of necking cavity plate reducing necking unstability tendency - Google Patents
A kind of necking cavity plate reducing necking unstability tendency Download PDFInfo
- Publication number
- CN109201887A CN109201887A CN201811144576.XA CN201811144576A CN109201887A CN 109201887 A CN109201887 A CN 109201887A CN 201811144576 A CN201811144576 A CN 201811144576A CN 109201887 A CN109201887 A CN 109201887A
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- CN
- China
- Prior art keywords
- necking
- cavity plate
- wall
- annular groove
- necking cavity
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D41/00—Application of procedures in order to alter the diameter of tube ends
- B21D41/04—Reducing; Closing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The present invention relates to a kind of necking cavity plates of reduction necking unstability tendency, it belongs to light-alloy plastic forming technology field.The present invention mainly solves the easy unstability of blank lower semisection existing for existing necking cavity plate, easily causes the technical issues of parts scrap and waste material.The technical solution adopted by the present invention is that: a kind of necking cavity plate reducing necking unstability tendency, it is on the basis of necking cavity plate inner wall bus, in necking cavity plate inner wall, multiple tracks transverse annular groove is set, the ratio of necking cavity plate inner wall interval skew wall height H and transverse annular groove height L is straight sky ratio H/L, straight empty than being 1:1~1:1.6, the depth t of transverse annular groove is 0.5~3mm.The present invention is suitable for various non-ferrous metals and ferrous metal, and the scope of application is wider.
Description
Technical field
The present invention relates to a kind of necking cavity plates of reduction necking unstability tendency, it belongs to light-alloy plastic forming technology neck
Domain.
Background technique
In traditional necking down process, the form of bus bars of necking cavity plate inner wall is essentially divided into two kinds of situations, and one is contractings
Stomatodeum mould bus is straight line (see Fig. 1), and another necking cavity plate bus is curve (see Fig. 2).
If necking cavity plate form of bus bars is straight line, because of cavity plate inner wall and the completed necking area meeting of blank
100% contact, therefore as necking process carries out, cavity plate inner wall can be increasing with blank contact area, and such press machine is logical
Cross the axial compressive force F that cavity plate passes to blank cylinderAxisIncreasing, a possibility that unstability occurs for blank cylinder lower end, is just increasingly
Greatly.Therefore, existing necking down process, which can only carry out local necking not, can be carried out whole necking, can only carry out necking coefficient greater than 0.73
Deformation, not can be carried out deformation of the necking coefficient less than 0.73.
In order to solve the above technical problems, necking cavity plate form of bus bars is become curve by applicant, as necking process carries out,
The microcosmic approximate continuous broken line of the completed choke denominator line of blank, broken line cusp are contacted with cavity plate inner wall, remaining is not contacted, this
The contact area of sample, blank and cavity plate inner wall can reduce 50%~60% for rectilinear generatrix, the reduction of contact area
Press machine is set to pass to the axial compressive force F of blank cylinder lower endAxisReduce, reduces the unstability tendency of blank barrel.
Although necking cavity plate form of bus bars becomes curve, the unstability tendency of blank barrel can be reduced.But it is big to carry out
Type tube body entirety necking and the smaller (K of necking coefficientContracting<0.7), when ratio of height to thickness (H/t>=30) biggish necking down process, if only
Using curve as cavity plate form of bus bars, when press machine pushes, as long as passing to the axial compressive force F of blank cylinder lower endAxisExceed
Blank cylinder lower end support strength, necking process still can make blank cylinder lower end unstability.
In addition, traditional necking down process, the necking for necking coefficient less than 0.73 is passed through to be carried out frequently with multi-pass technique.But
Using multi-pass necking down process the disadvantage is that: 1. process flow is long, low efficiency；2. each necking requires to smear a large amount of lubricants
Reduce frictional force, it is time-consuming；3. multi-pass uses press, energy consumption is higher；4. multi-pass multi-mould, capital investment are big.
Summary of the invention
Present invention aim to address the easy unstability of blank lower semisection existing for existing necking cavity plate, easily cause parts scrap
The technical issues of with waste material, provides a kind of necking cavity plate of reduction necking unstability tendency.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of necking cavity plate reducing necking unstability tendency, it is recessed in necking on the basis of necking cavity plate inner wall bus
Multiple tracks transverse annular groove, the ratio of necking cavity plate inner wall interval skew wall height H and transverse annular groove height L is arranged in mould inner wall
To be straight empty than H/L, straight empty than being 1:1~1:1.6, the depth t of transverse annular groove is 0.5~3mm.
Further, the necking cavity plate inner wall bus is any one in curve or straight line.
Further, the selection of the necking cavity plate inner wall form of bus bars according to the outer profile and machining allowance of product come
It determines.
The invention has the benefit that
The present invention opens up transverse annular groove in necking cavity plate inner wall, so that necking cavity plate reduces blank during necking
With the contact area of cavity plate, frictional resistance is reduced, flow condition when reducing necking process small end flow keeps necking deformation axial
Pressure demand reduces, and reduces unstability tendency.In this way, blank barrel can be thinner, ratio of height to thickness acceptability limit can with H/t≤30,
Wall thickness reduction increases forming accuracy, improves the utilization rate of material.Compared with the background art, the invention has the advantages that
1, the present invention can under lesser pressure can necking, reduce necking force, reduce blank cylinder lower end
Unstability tendency, reduces tonnage, saves energy consumption.
2, necking ability of the present invention is stronger, and necking coefficient further decreases, and is reduced by traditional limit necking coefficient 0.73
It is 0.53, it is more traditional to reduce 27%.
3, The present invention reduces the smearing number of lubricant, number of molds is changed to a time by traditional multi-pass multi-mould
Single mold is greatly saved the investment of mold fund, reduces process flow, improves production efficiency.
4, the present invention is suitable for various non-ferrous metals and ferrous metal, and the scope of application is wider.
Detailed description of the invention
Fig. 1 is the necking cavity plate schematic diagram that necking cavity plate form of bus bars is straight line；
Fig. 2 is the necking cavity plate schematic diagram that necking cavity plate form of bus bars is curve；
Fig. 3 is the schematic diagram that necking cavity plate bus of the present invention is curve；
Fig. 4 is the schematic diagram that necking cavity plate bus of the present invention is straight line；
Fig. 5 is that straight sky of the invention compares schematic diagram.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Embodiment 1
As shown in Figure 3 and Figure 5, one of the present embodiment reduces the necking cavity plate of necking unstability tendency, recessed in necking
On the basis of 1 inner wall bus of mould is curve, multiple tracks transverse annular groove 2 is set in necking cavity plate inner wall, between necking cavity plate inner wall
It is straight sky than H/L every the ratio of skew wall height H and transverse annular groove height L, straight empty ratio is 1:1.2, transverse annular groove 2
Depth t is 2mm.The quantity of transverse annular groove 2 can take 5~10 on necking cavity plate height dimension.
Embodiment 2
As shown in Figure 4 and Figure 5, one of the present embodiment reduces the necking cavity plate of necking unstability tendency, recessed in necking
On the basis of 1 inner wall bus of mould is straight line, multiple tracks transverse annular groove 2 is set in necking cavity plate inner wall, between necking cavity plate inner wall
It is straight sky than H/L every the ratio of skew wall height H and transverse annular groove height L, straight empty ratio is 1:1.5, transverse annular groove 2
Depth t is 3mm.The quantity of transverse annular groove 2 can take 5~10 on necking cavity plate height dimension.
The selection of the necking cavity plate inner wall form of bus bars is determined according to the outer profile of product and machining allowance.
The straight empty ratio can arbitrarily be chosen in the section 1:1~1:1.6.
The depth t of the transverse annular groove 2 can arbitrarily choose in the section 0.5~3mm.
With transverse annular groove and necking cavity plate inner wall bus is the permitted necking coefficient K value of necking cavity plate of curve
Smaller (being smaller than 0.6), necking effect are best；Since necking cavity plate inner wall is curve and transverse annular groove during necking
Collective effect, greatly reduced with the contact area of blank, flow axial compressive force F allowableAxisAlso reduce therewith, enable blank unstability
It is preferably minimized.
With transverse annular groove and necking cavity plate inner wall bus is the permitted necking coefficient K value of necking cavity plate of straight line
It is larger between 0.6-0.73 compared to the former, because there was only transverse annular groove independent role during necking to reduce
The contact area of blank cylinder and necking cavity plate inner wall, contact area are greater than the former, and necking effect is taken second place.
Claims (3)
1. a kind of necking cavity plate for reducing necking unstability tendency, it is characterised in that: on the basis of necking cavity plate inner wall bus,
Multiple tracks transverse annular groove, necking cavity plate inner wall interval skew wall height H and transverse annular groove height L is arranged in necking cavity plate inner wall
Ratio be straight empty than H/L, straight empty than being 1:1~1:1.6, the depth t of transverse annular groove is 0.5~3mm.
2. the necking cavity plate according to claim 1 for reducing necking unstability tendency, it is characterised in that: in the necking cavity plate
Wall bus is any one in curve or straight line.
3. the necking cavity plate according to claim 2 for reducing necking unstability tendency, it is characterised in that: in the necking cavity plate
The selection of wall form of bus bars is determined according to the outer profile of product and machining allowance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811144576.XA CN109201887B (en) | 2018-09-29 | 2018-09-29 | Necking die for reducing necking instability tendency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811144576.XA CN109201887B (en) | 2018-09-29 | 2018-09-29 | Necking die for reducing necking instability tendency |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109201887A true CN109201887A (en) | 2019-01-15 |
| CN109201887B CN109201887B (en) | 2020-06-09 |
Family
ID=64982083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811144576.XA Active CN109201887B (en) | 2018-09-29 | 2018-09-29 | Necking die for reducing necking instability tendency |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109201887B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1217241A (en) * | 1997-11-17 | 1999-05-26 | 曾绍谦 | Simple tube-drawing method and apparatus |
| CN1225298A (en) * | 1998-02-05 | 1999-08-11 | 曾绍谦 | Method and equipment for reducing tube end by roll forging |
| KR20090051935A (en) * | 2007-11-20 | 2009-05-25 | 양해진 | Method for making the reinfos-bar of the seat frame in vehicle, and apparatus for making it |
| CN201366468Y (en) * | 2009-03-12 | 2009-12-23 | 上海纳铁福传动轴有限公司 | Transmission shaft tube mouth narrowing die for avoiding bellmouthed opening |
| TWM445467U (en) * | 2012-08-20 | 2013-01-21 | West North Machine Works Ltd | Tube shrinking machine |
| CN202725832U (en) * | 2012-08-31 | 2013-02-13 | 慈溪市天时机械有限公司 | Necking cavity plate |
| CN204953710U (en) * | 2015-09-14 | 2016-01-13 | 浙江博尔德机械有限公司 | Pipe fitting throat mold processing |
| CN105499418A (en) * | 2016-01-29 | 2016-04-20 | 哈尔滨工业大学 | Necking device of ultrathin-wall cylindrical part and application method of necking device |
-
2018
- 2018-09-29 CN CN201811144576.XA patent/CN109201887B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1217241A (en) * | 1997-11-17 | 1999-05-26 | 曾绍谦 | Simple tube-drawing method and apparatus |
| CN1225298A (en) * | 1998-02-05 | 1999-08-11 | 曾绍谦 | Method and equipment for reducing tube end by roll forging |
| KR20090051935A (en) * | 2007-11-20 | 2009-05-25 | 양해진 | Method for making the reinfos-bar of the seat frame in vehicle, and apparatus for making it |
| CN201366468Y (en) * | 2009-03-12 | 2009-12-23 | 上海纳铁福传动轴有限公司 | Transmission shaft tube mouth narrowing die for avoiding bellmouthed opening |
| TWM445467U (en) * | 2012-08-20 | 2013-01-21 | West North Machine Works Ltd | Tube shrinking machine |
| CN202725832U (en) * | 2012-08-31 | 2013-02-13 | 慈溪市天时机械有限公司 | Necking cavity plate |
| CN204953710U (en) * | 2015-09-14 | 2016-01-13 | 浙江博尔德机械有限公司 | Pipe fitting throat mold processing |
| CN105499418A (en) * | 2016-01-29 | 2016-04-20 | 哈尔滨工业大学 | Necking device of ultrathin-wall cylindrical part and application method of necking device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109201887B (en) | 2020-06-09 |
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